Posted: Thu Jul 27, 2023 10:26am
You don't pay tax on your savings in Spain. You do pay tax on the interest earned on those saving which are declared in your world wide income.
As you are moving in the second half of the year, you will not become tax residents until next year so don't have to file an income tax return until 2025 for income earned in 2024. Income earned this year (2023) will not have to be declared.
The Spanish financial year is January to December and you have to spend more than 183 in Spain to be classed as a tax paying resident.
Ensure you complete an FD9 declaration that you are resident in Spain and send it to HMRC so they will stop taking tax from your private pension in UK and will only be taxed in Spain. You can't do that until you become a fiscal resident and get a tax residency form from the Spanish tax office.